Re: X-ray diffraction area monitors

[steve hand <hand@wam.umd.edu>]

Wade:

    I use the NaI when inspecting to look for scatter or leakage from these units -
I like the response in the 10-40 keV range, a little better than the end window GM.
If you go to the RADSAFE search http://romulus.ehs.uiuc.edu/SFgate/  and  type in
low energy x-ray 8 kev you will find some responses to surveying XRDs with
instruments as well.

    Hope this was helpful.

Steve Hand
Radiation Safety
University of Maryland

"Wade Sewell (302) 695-6627" wrote:

> Hello Radsafers!
>
> I have a few questions regarding monitoring areas where analytical x-ray
> diffraction units are used.  Currently, we are using a Ludlum model 177 alarm
> ratemeter with an end-window GM probe placed approximately 6" from the beam port
> to monitor scatter.  Because of the low efficiency for x-rays, we would like to
> switch the probe to possibly a Ludlum model 44-17 (which is an end-window 2" x
> 2mm NaI detector recommended for use between 10 and 60 keV).
>
> What would you recommend for this application?
>
> Do you monitor the area where x-ray diffraction units are used?
>
> What do you set the alarm at?
>
> A few details:  these units are not "cabinet" systems and they are operated at
> 50 kVp at 100mA.
>
> Thank you!
> Wade Sewell
> wade.a.sewell@dupontpharma.com
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